Data Retrieval - Queries

Normally work is carried out in a controller or in a DAO - data access object. From both points there are a number of methods of retrieving data.

Connected

If configured, you are connected to the default database and the connection is available at $this->db - it can be assumed (unless the data source is not being available).

Basic

As close to the datasource as exists, using $this->db->Q will return a MySQL/SQLite result which can then be iterated.

class contacts extends Controller {
    function listall() {
        if ( $res = $this->db->Q('SELECT * FROM contacts')) {
            while ( $row = $res->fetch()) { // wrapper "fetch" works with both MySQL and SQLite
                // do something

            }

        }

    }

}

Result Class

The Result class offers more services, including advanced sets of data which can be manipulated inline for reporting or data compilation.

This class can also return general or specific dto objects.

Specific DTO Objects

A general dto object is equivalent to a MySQL's fetch_object data structure, this can be made more specific by including a template in the app\dao\dto folder

dtoSet

The result class can return all the rows of a given query in an array of dtos.

class contacts extends Controller {
    function listall() {
        if ( $res = $this->dbResult('SELECT * FROM contacts')) {
            while ( $dto = $res->dto()) {
                // do something

            }

            // or
            $dtos = $res->dtoSet();
            foreach ( $dtos as $dto) {
                // do something

            }

        }

    }

}

dtoSet advanced

The dtoSet is simply iterates the result and stores it in an array, further manipulation is possible by passing a replacement function.

class contacts extends Controller {
    function listall() {
        if ( $res = $this->Result('SELECT * FROM contacts')) {
            $dtos = $res->dtoSet( function( $dto) {

                $dto->timeProcessed = time();   // add to the data

                return $dto;    // to be sure, otherwise you will have no data !

            });

            foreach ( $dtos as $dto) {
                // do something

            }

        }

    }

}